Valve



FIG. 1 is a front perspective view of a valve showing my new design, the valve is mounted on a respirator mask and positioned over a face of a user which are shown in broken lines for illustrative purposes only and form no part of the claimed design;

FIG. 2 is an enlarged front elevational view thereof;

FIG. 3 is an enlarged left side elevational view thereof;

FIG. 4 is an enlarged bottom plan view thereof;

FIG. 5 is an enlarged top plan view thereof;

FIG. 6 is an enlarged right side elevational view thereof; and,

FIG. 7 is an enlarged back elevational view thereof. 

The ornamental design for a valve, as shown and described. 